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Glossary
ACL
Access Control List. ACLs can limit network traffic and restrict access to certain users or
devices by checking each packet for certain IP or MAC (i.e., Layer 2) information.
ARP
Address Resolution Protocol converts between IP addresses and MAC (hardware) addresses.
ARP is used to locate the MAC address corresponding to a given IP address. This allows the
switch to use IP addresses for routing decisions and the corresponding MAC addresses to
forward packets from one hop to the next.
BOOTP
Boot Protocol. BOOTP i
s
used to provide bootup information for network devices, including
IP address information, the address of the TFTP server that contains the devices system files,
and the name of the boot file.
BGP
Border Gateway Protocol is a protocol used to make core routing decisions on the Internet.
It maintains a table of IP networks to register reachability among autonomous systems (AS).
BGP makes routing decisions based on path, network policies and/or rule-sets.
CoS
Class of Service is supported by prioritizing packets based on the required level of service,
and then placing them in the appropriate output queue. Data is transmitted from the
queues using weighted round-robin service to enforce priority service and prevent
blockage of lower-level queues. Priority may be set according to the port default, the
packet’s priority bit (in the VLAN tag), TCP/UDP port number, IP Precedence bit, or DSCP
priority bit.
DHCP
Dynamic Host Control Protocol. Provides a framework for passing configuration information
to hosts on a TCP/IP network. DHCP is based on the Bootstrap Protocol (BOOTP), adding the
capability of automatic allocation of reusable network addresses and additional
configuration options.
DHCP Option 82
A relay option for sending information about the requesting client (or an intermediate relay
agent) in the DHCP request packets forwarded by the switch and in reply packets sent back
from the DHCP server. This information can be used by DHCP servers to assign fixed IP
addresses, or set other services or policies for clients.
DHCP Snooping
A technique used to enhance network security by snooping on DHCP server messages to
track the physical location of hosts, ensure that hosts only use the IP addresses assigned to
them, and ensure that only authorized DHCP servers are accessible.
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